Wednesday, May 6, 2009

Bunyi Modem

Jika kita menyalakan modem analog, kita selalu mendengar bunyi yang keras ketika modem tersebut memutar nomor dial telepon. Kenapa demikian?

Modem adalah singkatan modulator-demodulator dimana sebuah modem analog dapat mengubah sinyal digital ke dalam sinyal suara secara analog (modulasi) kemudian memproses sinyal yang datang tersebut dengan cara demodulasi. Sedangkan bunyi suara yang ditimbulkan dari modem tersebut disebut juga dengan suara pengenal. Kemudian data disimpan secara digital manakala dihubungkan dengan line telepon. Selain itu, suara pengenal tersebut harus dikirim dengan frekuensi 1300 hertz dan dengan panjang waktu tertentu, sekitar 0,6 detik tone dan 1,9 detik pause.
Tips: Beberapa modem bisa dimodifikasi pada bagian pengatur suara kemudian meminimalisasi suaranya.

Sumber: Computer Easy Mei 2004

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